Life's EdgeBy: Carl Zimmer 'Profound, lyrical, and fascinating, Lifes Edge will give you a newfound appreciation for life itself. It is the work of a master science writer at the height of his skills.' Ed Yong, author of An Immense World We all assume we know what life is, but the more scientists learn about the living world from protocells to brains, from zygotes to pandemic viruses the harder they find it to locate the edges of life, where it begins and ends.